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arXiv 2003.11482physics.optics
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一种高效率的集成扭曲单光子源

A highly efficient integrated source of twisted single-photons

Bo Chen, Yuming Wei, Tianming Zhao, Shunfa Liu, Beimeng Yao, Ying Yu, Jin Liu, Xue-hua Wang

摘要:

具有螺旋相位波前的光子(扭曲光子)可以携带离散的、原则上无限数量的轨道角动量(OAM)。扭曲单光子作为一种高维量子系统,其信息处理能力远远超过了目前广泛使用的二能级量子比特。迄今为止,携带OAM的单光子的产生仅仅依赖于体晶体中的非线性过程,例如,自发参量下转换(SPDC),这必然限制了源的效率和可扩展性。因此,在半导体芯片上的按需OAM量子光源对于集成光子量子技术来说仍然是虚幻的并且是非常期望的。在这里,我们展示了高效率的扭曲单光子发射从嵌入在一个microns与角光栅的固态量子发射器。腔QED效应允许在同一纳米结构中产生单光子和编码OAM,因此能够实现具有非常小的足迹和巨大可扩展性的器件。通过单光子与自身的量子干涉,可以清楚地识别单光子的OAM态。我们的器件可以促进集成量子光子器件的发展,在高维量子信息处理方面具有潜在的应用。

英文摘要:

Photons with a helical phase front (twisted photons) can carry a discrete, in principle, unbounded amount of orbital angular momentum (OAM). Twisted single-photons have been demonstrated as a high-dimensional quantum system with information processing ability far beyond the widely used two-level qubits. To date, the generations of single-photons carrying OAM merely rely on the non-linear process in bulk crystals, e.g., spontaneous parametric down-conversion (SPDC), which unavoidably limits both the efficiency and the scalability of the source. Therefore, an on-demand OAM quantum light source on a semiconductor chip is yet illusive and highly desirable for integrated photonic quantum technologies. Here we demonstrate highly-efficient emission of twisted single-photons from solid-state quantum emitters embedded in a microring with angular gratings. The cavity QED effect allows the generations of single-photons and encoding OAM in the same nanostructure and therefore enables the realization of devices with very small footprints and great scalability. The OAM states of singe-photons are clearly identified via quantum interference of single-photons with themselves. Our device may boost the development of integrated quantum photonic devices with potential applications towards high-dimensional quantum information processing.

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